agree with this poster. my "normal" is falling asleep between 00h-02h (12am-2am) and waking between 09-10h (9am - 10am). waking up earlier than this usually results in me being irritable for the first few hours of being awake. i spent thousands on CBT-i in part to try and become a morning person and fix this. it did quell my insomnia, but the "morning person" part of my routine eroded away.